在读取数据，操作和输出时出错

Question

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Answer 1

我猜那是因为你有：

while (inputFile.hasNext()) 

使用Scanner.hasNextLine。

编辑：

我与样品输入测试你的代码。我明白你的意思了。

while (inputFile.hasNextLine()) { 
      employeeID = inputFile.nextLine(); // Read info from first line and store it in employeeID 
      employeeName = inputFile.nextLine(); // Read info from next line and store it in employeeName 

      userInput = JOptionPane.showInputDialog("Employee Name: " + employeeName + "\nEnter number of" + // display employee name and ask for number of hours worked 
      " hours worked:"); 

      hours = Double.parseDouble(userInput); // Store user's parsed input into hours 
      wageRate = inputFile.nextDouble(); // Read info from next line and store it in wageRate 
      taxRate = inputFile.nextDouble(); // Read info from next line and store it in taxRate 

使用hasNextLine作为你的情况只会确保对nextLine下一个电话将是有效的。但是，您的电话nextLine两次，然后拨打nextDouble之后。您可以（1）确保您的电话与文件完全匹配，或者（2）每次您拨打下一个时检查是否有下一个令牌。我认为（1）是你的问题。

我能够用下面的修复程序：

while (inputFile.hasNextLine()) { 
    employeeID = inputFile.nextLine(); 
    employeeName = inputFile.nextLine(); 
    userInput = JOptionPane.showInputDialog("Employee Name: " + employeeName + "\nEnter number of hours worked:"); 
    hours = Double.parseDouble(userInput); 
    wageRate = Double.parseDouble(inputFile.nextLine()); 
    taxRate = Double.parseDouble(inputFile.nextLine()); 
    Paycheck paycheck = new Paycheck(employeeID, employeeName, wageRate, taxRate, hours); 
    paycheck.calcWages(); 
    JOptionPane.showMessageDialog(null, "Employee ID: " + 
      paycheck.getEmployeeID() + "\nName: " + 
      paycheck.getEmployeeName() + "\nHours Worked: " + 
      hours + "\nWage Rate: $" + 
      money.format(paycheck.getWageRate()) + "\nGross Pay: $" + 
      money.format(paycheck.getGrossPay()) + "\nTax Rate: " + 
      paycheck.getTaxRate() + "\nTax Withheld: $" + 
      money.format(paycheck.getTaxWithheld()) + "\nNet Pay: $" + 
      money.format(paycheck.getNetPay())); 
} 

文件内容：

00135 
John Doe 
10.50 
0.20 
00179 
Mary Brown 
12.50 
1.20